In an operating A/C schematic, what would be expected voltage across the primary of a transformer?

When evaluating the expected voltage across the primary of a transformer in an A/C schematic, it's important to consider the standard voltage levels typically used in residential and commercial electrical systems. In many areas, the primary voltage for transformers feeding devices and equipment is commonly set to either 120 volts or 240 volts, with 240 volts being standard for larger appliances and systems.

The correct answer indicates that 240 volts is expected across the transformer's primary side, which aligns with typical configurations in certain types of equipment. This voltage level allows for effective operation of a range of devices that require higher power levels, such as air conditioning units, water heaters, and other industrial applications that benefit from reduced current flow at higher voltages.

In contrast, lower voltages such as 12 volts and 48 volts are usually associated with low-voltage applications, such as control circuits or specialized equipment, and are not typically found as primary voltages in standard A/C transformer configurations. 120 volts, while common in residential circuits for lighting and small appliances, does not apply universally to the primary side of transformers used in larger applications.

Thus, recognizing the context of transformer operation within A/C systems highlights why the voltage of 240 volts is the expected and correct choice for the primary configuration